Piston



T. KEENAN PISTON June 2, 1925.l 1,540,478

Filed Sept. 5, 1924 Figi. I

J4 ,1% EZ .w 7.2 10 z f Iz INVENTOR 177mm d5 Xe n cm Patented .lune 2 19295. l H

UNITED. sTAT To all wimmz't' 'may' concern.

Be it known rthat I, THoMAs Kn'nNAN, a citizen of the United States, residin at Brooklyn, in the county of Kings and tate of New York, have invented new and use` ful Improvements in Pistons, of which vthe following is a specification. This invention relates to a piston which is preferably adapted for internal combustion 'engines but couldbe used with any other type ofe-ngine.

An object of the invention is to provide a head with a 'depending skirt havingan air space adjacent the head for ermitting air from above .to force the pac ing ring out-- ward. y g

Another-object of the invention is to provide a resilient sleeve .attached to the lower part ofthe skirt so that the portion above the attached part is free to assume the shape of the bore of a cylinder in which the' piston slides. Another object of the invention is to provide a packing ring inside of the sleeve at its top end so as to vprevent leakage of oil from above to the interiorv of thesleeve.

Another object of the invention is to pro vvide means for carrying the packing rings i arranged at the upper portion ofthe skirt and spaced` therefrom to permit expansion .or contraction of the head.

' Another object of the invention is to pro-\ vide the lower endof the sleeve with a packthe bine. i i

The invention resides more particularly in the novel combinations.hereinafter del scribed and claimed reference being made to the accompanying drawing in which v Fig. 1 represents a vertical 'section of `a piston embodying this invention.

Vline 2 -2 of thesame. l Fig. 3 is a plan view thereof. .In the drawing the numeral 5 designates a headhavingf'a depending skirt 6 cast 02E duraluminum to make it as light as possible. The skirt has hubs with brass bushings 8 one being opposite the other to provide. bearings .for a wrist sin not shown, on l which a connecting ro is mounted -as is well-knowm/Aport-ion of the skirt is con` 'cave to form an airs ace 9 between the outer wall'of a skirt an the cylindert.

THOMAS KEENAN, or imooinzriv',` NEW Yom;

of the packing rings. Fig. 2 is asimilar section taken .along the' PATENT oFFicE.

risroiv.

'li'zfrs y Il hpplicatlon lied September 3, A1924. Serial No. 735,561.

An annular member 10'is screwed at 11 to the upper portion of the skirt. The part above the thread ofthe member is recessed or milled to form an annular channel l2 about the head which communicates with a skirt against' the bore ofl the cyli'ings or forces 'them outwardto face witlithe bore of the cylinder a brass I vsleeve 16 is provided. The sleeve is screwed at 17 to theA skirt and a shoulder 1S butts 4'against the bottom of theskirt to limit the upward-adjustment of the sleeve.4 The por.

tion of the sleeve above the thread sets Aloosely about the skirt anda s lit packing ring 19 carried by the annu ar member presses against the interior of the sleeve to prevent any liuid from entering the space between 'the skirt and sleeve. The lower,

end of the sleeve carries a packing ring 20)- f and orifices 21'` in the skirt permitthe air vfrom below to expand thepacking in order to give a tight joint-with the bore of the cylinder. The method of" attaching the resilient sleeve to the skirt permits the portion above vthe thread to shape itself to an irregula-r cylinder bore land itv also permits expension or contraction of the sleeve' without anger of fracture or breakage. f `lf claim 1. A piston having a head with a depending skirt, an annular member connected to .the skirt, packing rings carried by the member, and means arranged between the mein- -ber and skirt for admitting air to the back 2. A'piston havin head with a depend- O'EL 3. A piston having a head with a depend' i ing skirt, an annullar member screwed to the upper portion of the skirt, packing rings "carried bythe member, said member being ics ing skirt,an annular member having aseries 7 of holes screwed to the upper portion of the skirt, packing rings carried by the member, said member being made to form a channel j. adjacent the head to conduct air from above through the holes to the backs ing rings.

4. A piston having a head with a depending skirt, an annular member screwed to theupper portion of the skirt, a packing ring carried by the member, and a sleeve attached to the lower portion of the skirt 'the upper end of which sets over the packing to pre- 'vent leakage between the skirt and sleeve.

5. A piston having a head with a depending skirt, an annular member screwed to the upper portion of the skirt, a packing ring carried by the member, a sleeve attached to the lower portion of the skirt the upper end of which sets over the ...packing to prevent leakage between the skirt'and sleeve,r and a;

'of the pack-'f packing ring arranged at the lower end of the sleeve. 6. A piston having a head with a depending skirt, an annular member screwed to the 'upper portion of the skirt, a packin ring carried by themember, a sleeve attac ed to the lower .portion of the skirt the upper end'- In testimony whereof I have hereunto set my hand.

. lfierroMits KEENAN. 

